/**************************************************************************
 *
 * Copyright (C) 2007 University of California, Los Angeles.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 *************************************************************************/

package edu.ucla.cs.typecast.event;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.InetAddress;

import edu.ucla.cs.typecast.bloomfilter.BloomFilter;
import edu.ucla.cs.typecast.bloomfilter.BloomFilterEncoder;
import edu.ucla.cs.typecast.net.EndPoint;
import edu.ucla.cs.typecast.net.TransportSender;
import edu.ucla.cs.typecast.net.TransportSenderFactory;
import edu.ucla.cs.typecast.util.TypeUtil;

public class EventSourceImpl implements EventSource {

	private Class[] types; 
	private BloomFilter filter; 
	private TransportSender transportSender; 
	private EventMarshaller marshaller = new EventMarshaller(); 
	
	public EventSourceImpl(EndPoint endPoint,  Class[] validTypes) {
		try { 
			this.types = validTypes; 
			EndPoint target = endPoint; 
			transportSender = TransportSenderFactory.createTransportSender(target); 
			//filter = BloomFilterEncoder.encode(TypeUtil.getAllTypes(validTypes)); 
			// Create an empty bloom filter here
			filter = new BloomFilter(); 
		} catch(Throwable t) { 
			t.printStackTrace(); 
			throw new RuntimeException(t); 
		}

	}


	public void publishEvent(Object event) throws InvalidTypeException, IOException {
		// Check if the event has an allowed type
		// (i.e. one of the classes in types array)
		if (! (event instanceof MetaEvent)) { 
			for (Class validType : types) {
				if (!validType.isInstance(event)) {
					System.out.println("Warning: event " + event.getClass() + " is not registered type " + validType); 
					throw new InvalidTypeException("Warning: event " + event.getClass() + " is not registered type " + validType); 
				}
			}
		}
		TypedEvent typedEvent = new TypedEvent(types, event); 
		ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); 
		marshaller.marshall(outputStream, typedEvent); 
		byte[] packet = outputStream.toByteArray(); 
		transportSender.send(filter, packet, 0, packet.length); 
	}

}
